Claude Opus 5.5 - Unifically

Claude Opus 5.5 is Anthropic’s Opus model from the Claude 5.5 family, released September 22, 2026, for agentic coding, long-running agents, and knowledge work. It takes text and image input, outputs text, and carries a 1M token context window with up to 128k output tokens. Adaptive thinking is always on and cannot be disabled; effort defaults to medium.

Model

anthropic/claude-opus-5-5


Provider	Anthropic
Name	Claude Opus 5.5

Supported Endpoints

All three API formats are supported:

Chat Completions — POST /v1/chat/completions
Responses — POST /v1/responses
Messages — POST /v1/messages

Example

curl -X POST https://api.unifically.com/v1/messages \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "anthropic/claude-opus-5-5",
    "max_tokens": 4096,
    "messages": [
      {"role": "user", "content": "Design a distributed job queue with exactly-once semantics."}
    ]
  }'

Volume discounts are available for almost all models. Reach out at contact@unifically.com to discuss custom pricing.

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​Supported Endpoints

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Model

Supported Endpoints

Example